14.2.1.2.19. TiQR Token

The TiQR token is a special App based token, which allows easy login and which is based on OCRA.

It generates an enrollment QR code, which contains a link with the more detailed enrollment information.

For a description of the TiQR protocol see

The TiQR token is based on the OCRA algorithm. It lets you authenticate with your smartphone by scanning a QR code.

The TiQR token is enrolled via /token/init, but it requires no otpkey, since the otpkey is generated on the smartphone and pushed to the eduMFA server in a seconds step.

14.2.1.2.19.1. Enrollment

  1. Start enrollment with /token/init

  2. Scan the QR code in the details of the JSON result. The QR code contains a link to /ttype/tiqr?action=metadata

  3. The TiQR Smartphone App will fetch this link and get more information

  4. The TiQR Smartphone App will push the otpkey to a link /ttype/tiqr?action=enrollment and the token will be ready for use.

14.2.1.2.19.2. Authentication

An application that wants to use the TiQR token with eduMFA has to use the token in challenge response.

  1. Call /validate/check?user=<user>&pass=<pin> with the PIN of the TiQR token

  2. The details of the JSON response contain a QR code, that needs to be shown to the user. In addition the application needs to save the transaction_id in the response.

  3. The user scans the QR code.

  4. The TiQR App communicates with eduMFA via the API /ttype/tiqr. In this step the response of the App to the challenge is verified. The successful authentication is stored in the Challenge DB table. (No need for the application to take any action)

  5. Now, the application needs to poll /validate/polltransaction?transaction_id=<transaction_id> to check the transaction status. If the endpoint returns false, the challenge has not been answered yet.

  6. Once /validate/polltransaction returns true, the application needs to finalize the authentication with a request /validate/check?user=<user>&transaction_id=<transaction_id>&pass=. The pass can be empty. If value=true is returned, the user authenticated successfully with the TiQR token.

This code is tested in tests/test_lib_tokens_tiqr.

14.2.1.2.19.3. Implementation

class edumfa.lib.tokens.tiqrtoken.TiqrTokenClass(db_token)[source]

The TiQR Token implementation.

Create a new TiQR Token object from a database object

Parameters:

db_token (DB object) – instance of the orm db object

classmethod api_endpoint(request, g)[source]

This provides a function to be plugged into the API endpoint /ttype/<tokentype> which is defined in api/ttype.py See Tokentype endpoints.

Parameters:

  • request – The Flask request

  • g – The Flask global object g

Returns:

Flask Response or text

check_challenge_response(user=None, passw=None, options=None)[source]

This function checks, if the challenge for the given transaction_id was marked as answered correctly. For this we check the otp_status of the challenge with the transaction_id in the database.

We do not care about the password

Parameters:

  • user (User object) – the requesting user

  • passw (string) – the password (pin+otp)

  • options (dict) – additional arguments from the request, which could be token specific. Usually “transaction_id”

Returns:

return otp_counter. If -1, challenge does not match

Return type:

int

client_mode = 'poll'
create_challenge(transactionid=None, options=None)[source]

This method creates a challenge, which is submitted to the user. The submitted challenge will be preserved in the challenge database.

If no transaction id is given, the system will create a transaction id and return it, so that the response can refer to this transaction.

Parameters:

  • transactionid – the id of this challenge

  • options (dict) – the request context parameters / data

Returns:

tuple of (bool, message, transactionid, reply_dict)

Return type:

tuple

The return tuple builds up like this: bool if submit was successful; message which is displayed in the JSON response; additional challenge reply_dict, which are displayed in the JSON challenges response.

static get_class_info(key=None, ret='all')[source]

returns a subtree of the token definition

Parameters:

  • key (string) – subsection identifier

  • ret (user defined) – default return value, if nothing is found

Returns:

subsection if key exists or user defined

Return type:

dict or scalar

static get_class_prefix()[source]

Return the prefix, that is used as a prefix for the serial numbers. :return: TiQR :rtype: basestring

static get_class_type()[source]

Returns the internal token type identifier :return: tiqr :rtype: basestring

get_init_detail(params=None, user=None)[source]

At the end of the initialization we return the URL for the TiQR App.

mode = ['authenticate', 'challenge', 'outofband']
update(param)[source]

This method is called during the initialization process.

Parameters:

param (dict) – parameters from the token init

Returns:

None